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                Coci2015 Police                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div>有N个书架，每个书架可以容纳M本书。给出了若干本书，每本书有一个正整数的唯一编号，且编号不超过N*M。 给出了初始时各个书架里面的书的编号，即给出二维数组S[1..N][1..M]。设S[i][j]=k，表示的意义是第i个书架的第j个格子放的那本书的编号是k。如果k等于0则说明该格子没有书，是空的。一个格子最多只能放一本书。再给出二维数组T[1..N][1..M]，表示最终你需要把这些书经过移动之后达到的目的。你移动书的过程需要满足如下两个条件：</div>
<div>1、你可以把某一个书架的书向左或者向右推动一格。这就是横向的&ldquo;推&rdquo;动作，你可以&ldquo;推&rdquo;任意多次。</div>
<div>2、你可以拿起某一个书架的一本书，然后把这本书放到任意书架的空格子里。这就是&ldquo;拿&rdquo;动作。你可以&ldquo;拿&rdquo;任意多次。注意：当你&ldquo;拿&rdquo;起一本书时，你是不能做&ldquo;推&rdquo;的动作。则&ldquo;拿&rdquo;起一本书，接下来的那个动作必须是把这本书放到一个空格子里。每次只能&ldquo;拿&rdquo;起一本书。</div>
<div>现在你的任务是：用最少次数的&ldquo;拿&rdquo;动作，去完成目标，如果无法完成目标，输出-1。</div>
<div></div>
<p style="margin: 10px auto; padding: 0px; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 13.920001029968262px; line-height: 13.333333015441895px;"></p>
<div></div>
<p></p></p><hr/><h3>输入格式</h3><p><div>第一行，两个整数N和M。 1&lt;=N,M&lt;=1000。</div>
<div>接下来是N行M列的S二维数组。</div>
<div>接下来是N行M列的T二维数组。</div>
<div></div>
<p></p></p><hr/><h3>输出格式</h3><p><p>最少次数的&ldquo;拿&rdquo;动作。</p>
<div></div>
<div></div>
<p></p></p><hr/><h3>样例输入</h3><pre>2 4
1 0 2 0
3 5 4 0
2 1 0 0
3 0 4 5
</pre><hr/><h3>样例输出</h3><pre>2</pre><hr/><h3>提示</h3><p><div></div>
<div></div>
<p></p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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